LAMINATED THIN-FILM OPTICAL ELEMENT AND OPTICAL CONTROL METHOD AND OPTICAL CONTROLLER USING THE SAME

Japanese Patent JP3914998

B2

PROBLEM TO BE SOLVED: To make it possible to exhibit optical response of sufficient magnitude and high speed by using a laser beam of low power as control light.
SOLUTION: The control light is emitted from a light source 1 and signal light from a light source 2. The control light and the signal light are converged by a condenser lens 7 and is cast to the laminated thin-film optical element 8. Only the signal light is detected by a photodetector 22 through a photodetecting lens 9 and a wavelength selection filter 20. A heat lens is reversibly formed within the laminated thin-film optical element by on and off of the control light, by which the intensity modulation of the signal light may be embodied. The constitution of the thin-film optical element is composed of a laminated structure consisting of for example, a heat transmission layer film/heat insulating layer film/light absorption film/heat lens forming layer/light absorption film/heat insulating layer film/heat transmission layer. The thickness of the light absorption layer consisting of the laminated structure of the light absorption film/heat lens forming layer/light absorption film is so adjusted as not to exceed 2 times the confocal distance of the converged control light.

Takashi Hiraga
Chen Kunrong
Moriya Tetsuro
Norio Tanaka
Hiromitsu Yanagimoto
Ichiro Ueno
Koji Tsujita

JP35842998A

May 16, 2007

December 02, 1998

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National Institute of Advanced Industrial Science and Technology
Dainichi Seika Kogyo Co., Ltd.
Victor Company of Japan, Ltd.

G02F1/19; (IPC1-7): G02F1/19

JP1152435A
JP8286220A

Kenji Yoshida
Toshihiko Kanayama
Jun Ishida

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